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How to change oil seal lower unit 25 hp yamaha?

Posted by Anonymous on

  • ANTISPAMMER Jul 17, 2019

    you need to repost this in marine engines

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  • Yamaha Master
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6 Suggested Answers

6ya6ya

6ya staff

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SOURCE:

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Posted on Jan 02, 2017

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rgall3285

ray gallant

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SOURCE: hello, my brother has a 25 hp yamha that he say,s

yep there is about 3 if I recall the inside of lower unit .

Posted on Apr 25, 2010

budgie140

Ian Summerfield

  • 502 Answers

SOURCE: need to know how to change lower unit on 1971

put into nuetral,undo the five bolts around lower unit,take off sideplate halfway down leg casing,loosen the two bolts clamping the gear rods together,then lower unit should slide down[if driveshaft isnt stuck in the crankshaft spline].assembly is reverse,but take care putting water tube back into rubber grommet,and tighten gear rod clamp only after making sure that g/box is in nuetral,when gear lever also in nuetral,or matched together

Posted on Jul 01, 2010

Testimonial: "thank you so much for you help on the johnson 25hp lower unit . without your help we never could have done it. it is put back together and works great!!! keep up the great work. mamawhughes"

thomasnee

  • 677 Answers

SOURCE: lower unit oil

On the lower side of the gearbox,below the line of the prop shaft,you will see a screw that is about10-15mm across.This is the drain for the g/box oil.If you look above that screw about 150mm(6 inches),you will see another screw the same.It may even be marked 'oil level'.Remove them both.
Checked the drained oil is not milky.It's a sign of water and the propshaft seal would need to be replaced.
The oil bottle you buy will have a tapered nozzle.You must fill the g/box from the LOWER hole by sqeezing the bottle.When it comes out of the UPPER hole,the g/box is filled.Quickly put the lower screw back in first,and then the upper screw.Done.
Before you refill the g/box,check the washer/seal on the screws and make sure they are still good. Hope this helps

Posted on Jul 10, 2010

goldbill

william moore

  • 184 Answers

SOURCE: Need Parts diagram fo 25 H.P. yamaha lower unit

Most modern outboards had 2 tapped holes in the casting which would let you put a steering wheel puller on that part wit some all thread and push aginst the end of the prop shaft to get that piece off the lower.o

Posted on Oct 14, 2012

Jim51

Jim Beaty

  • 45 Answers

SOURCE: Yamaha outboard engine 4LK 6EO l 323627 HOW DO i CHANGE OIL IN

You do not have to remove the top plug. Just loosen it enough to allow oil to drain out the bottom. Same with filling, the top plug just has to be loose enough for air to escape as you pump oil in from the bottom. When the oil starts to seep out the top, stop pumping, close the top port screw and then put the bottom screw plug in. With the top port closed there should be enough vacuum created you shouldn't loose more than a few drops while installing the bottom plug. Please do not over fill the gear case, it needs a little air space. Also, try to avoid over pressurizing the gear case while testing, it only takes a couple pounds to identify a leak and not much more to create one. Another thing, change your gear oil in the fall before freeze up. If you store your outboard outside all winter and there is a little water emulsified in the gear oil, it will separate and freeze,, I have seen more than a few cracked gear cases from this alone.

Posted on Jun 15, 2013

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I have a 2003 yamaha 40 hp four stroke outboard, this year started up seemed to run great after about 25 minutes i shut it down an hour later checked oil crankcase full of water


water in the engine crank case oil --major seal or corrosion problem in the motor
water in the leg gear box --
pump seal on the drive shaft

Jun 01, 2017 | Yamaha Boating

Tip

Changing oil in lower unit on an outboard motor.


the oil in the lower gear case in a outboard motor should be changed every fall when you take the boat out or once a year if you live where you can boat all year. when you look at the lower unit down by the propeller you will find two screws one lower and one upper. take the upper one out first and check the nylon gasket and replace if worn. put a coffee can or and oil collector under the moter and take out the lower plug. if possible do this after the moter has been run recently, but never run an outboard out of the water unless you have the garden house hooked up to ear muffs over the water intake sites!
the oil will slowly drain out. if the oil looks like chocolate milk it probably has water in it which means its leaking at the upper or lower seals and needs a pressure check and possibly seal replacemant. after all the oil is out (30 minutes or so) its time to refill it. for less than ten bucks you can but a simple device that lets you pump the oil in instead of squezzing it out of the tube. you attach it to the lower drain plug hole and the to a quart of the proper fluid for your motor. make sure you buy the oil to match your type of outboard.
pump the oil or squeze it it from the bottom until it starts to come out the top hole. make sure all the bubbles are out then put the upper plug back in with good gasket, remove the oil tube or appicator from the bottom hole and quickly relace the bottom plug as well with a good gasket.
thats it and you are good to go for the season. if you see oil leaking out the prop shaft or at one of the plugs you need to attend to that soon. tip remember chocolate milk oil or actual water means a seal leak and must be repaired.it may just be a .25 nylon seal for one of the plugs is bad! any unusual noises of difficult or loud shifting can also means problems with the lower unit gears etc and its always cheaper to fix the problem sooner than later.
happy boating!!!!!!!!!!!!

on May 16, 2010 | Boating

1 Answer

Where is the oil filter located on a 2004 Yamaha outboard two stroke motor


Some links including a video of how to change the filter. In such questions horsepower is useful along with year :>) Oil filters would only be on a 4 stroke though to protect the engine oil. Your two stoke doesn't have filters in the lower unit. There may be a strainer in the two stroke oil tank.

check page 31 here
http://www.yamaha-motor.com/assets/service/manuals/1/LIT-18626-07-03_1415.pdf

Google
year make HP manual

http://www.bing.com/search?q=oil+filter+located+on+a+2004+Yamaha+outboard+two+stroke+motor&form=PRHPR1&src=IE11TR&pc=EUPP_HRTS

Jul 04, 2016 | Yamaha Yamalube Outboard Oil Change Kit...

1 Answer

Water in Lower Unit. Noticed when changing lower unit lube. 25 HP 4 stroke 5 years old.


one of the seals has gotten damaged fishline is the usual varmit around the prop shaft.check there first ,easiest to fix also or it might be drive shaft seal or shift rod seal .if you can put air pressure in the upper oil plug hole you might find where it is but do not use more than 15 or 20 lbs possible to blow all seals with too much.

Oct 21, 2014 | Boating

1 Answer

Lower unit oil


On the lower side of the gearbox,below the line of the prop shaft,you will see a screw that is about10-15mm across.This is the drain for the g/box oil.If you look above that screw about 150mm(6 inches),you will see another screw the same.It may even be marked 'oil level'.Remove them both.
Checked the drained oil is not milky.It's a sign of water and the propshaft seal would need to be replaced.
The oil bottle you buy will have a tapered nozzle.You must fill the g/box from the LOWER hole by sqeezing the bottle.When it comes out of the UPPER hole,the g/box is filled.Quickly put the lower screw back in first,and then the upper screw.Done.
Before you refill the g/box,check the washer/seal on the screws and make sure they are still good. Hope this helps

Jul 09, 2010 | Boating

1 Answer

How do I check the oil level in the lower unit of a 70 hp Johnson outboard?


remove the bottom drain screw first then place a tube of the proper lower unit oil in it. then remove the top screw and gently squeeze the tube of oil and when full it will slowly come out the top drain hole. when it does replace the lower plug first then the top plug second. make sure the seals are in good shape and plan on changing the oil in the lower unit yearly for proper maintainence. make sure you buy oil designed for your particular type of motor. good luck.

May 29, 2010 | Boating

4 Answers

Yamaha 30 HP 3 cylinder 2 stroke


pull the spark plugs and see if they look like there burnning the same if so then i dought its a spark issue and if it was in the lower unit u wouldnt here a loud anything it sounds like a rod bearing i have had the same thing happen to several yamahas under a load

Jul 06, 2009 | Light Outboard Motor Boat Bass Fishing...

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